We report the observation of dressed states of a quantum dot. The optically excited exciton and biexciton states of the quantum dot are coupled by a strong laser field and the resulting spectral signatures are measured using differential transmission of a probe field. We demonstrate that the anisotropic electron-hole exchange interaction induced splitting between the x- and y-polarized excitonic states can be completely erased by using the AC-Stark effect induced by the coupling field, without causing any appreciable broadening of the spectral lines. We also show that by varying the polarization and strength of a resonant coupling field, we can effectively change the polarization-axis of the quantum dot.
@article{arxiv.0711.4205,
title = {Observation of dressed excitonic states in a single quantum dot},
author = {Gregor Jundt and Lucio Robledo and Alexander Högele and Stefan Fält and Atac Imamoğlu},
journal= {arXiv preprint arXiv:0711.4205},
year = {2009}
}